netdev - Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

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Date:	Tue, 03 Nov 2015 18:01:30 +0100
From:	Oliver Hartkopp <socketcan@...tkopp.net>
To:	Aleksander Morgado <aleksander@...ksander.es>,
	Marek Vasut <marex@...x.de>
CC:	Vostrikov Andrey <andrey.vostrikov@...entembedded.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

On 11/03/2015 11:36 AM, Aleksander Morgado wrote:

> Unrelated to all this, another key point in ARINC is the timing for
> each label when transmitting. The common case you get is different
> labels being sent continuously with a given rate for each. E.g. labels
> 310 and 311 every 80ms, label 312 every 120ms and so on. I'm not sure
> the HOLT chips have any specific way of configuring this, but I've
> seen some USB devices which actually have APIs to say e.g. "send label
> 310 every 80ms" and then you can just update the value being sent
> without needing to take care of the TX rate. I'd have loved to see
> that instead of the complex filtering :) I know this is way too much
> for the generic kernel driver, though, so just a heads up of how this
> usually works.
> 

The CAN stack already has a solution for this.

The CAN_BCM socket is a programmable (content) filter for cyclic messages
which are common in automotive setups to detect timeouts in cyclic messages
(sender fails).

An the best thing: You can use the Linux internal high-res timers to send
messages - just by creating a TX_SETUP configuration for the BCM.

Read this:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/Documentation/networking/can.txt?h=linux-4.2.y#n634

Just one more reason to use PF_CAN :-)


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